contact dermatitis

Examples of contact dermatitis in the following topics:

• Rash

  • Contact dermatitis is a localized rash or irritation of the skin caused by contact with a foreign substance.
  • Only the superficial regions of the skin are affected in contact dermatitis.
  • In the Americas, the most common causes of allergic contact dermatitis are plants of the Toxicodendron genus: poison ivy, poison oak, and poison sumac.

• Hypersensitivity

  • Associated disorders: Contact dermatitis, Mantoux test, Chronic transplant rejection, Multiple sclerosis, T-cells VAutoimmune disease receptor mediated, Graves' disease,Myasthenia Gravis.

• Blister

  • Sometimes, the skin will blister when it comes into contact with a cosmetic, detergent, solvent or other chemical.
  • This is known as contact dermatitis.
  • Some chemical warfare agents, known as blister agents or vesicants, cause large, painful blisters wherever they contact skin; an example is mustard gas.
  • Dermatitis herpetiformis – a skin disease that causes intensely itchy blisters, usually on the elbows, knees, back and buttocks.

• Edema

  • It can be caused by systemic diseases, pregnancy in some women, either directly or as a result of heart failure, or local conditions such as varicose veins, thrombophlebitis, insect bites, and dermatitis.
  • Examples of edema in specific organs include cerebral edema, pulmonary edema, periorbital edema (eye puffiness), and cutaneous edema due to mosquito bites, spider bites, bee stings, or contact dermatitis).

• Complete Antigens and Haptens

  • A well-known example of a hapten is urushiol, which is the toxin found in poison ivy, a common cause of cell-mediated contact dermatitis, which is type IV hypersensitivity.

• Patellofemoral Stress Syndrome

  • Patellofemoral pain syndrome is discomfort originating from the contact of the posterior of the patella (kneecap) with the femur.
  • Patellofemoral pain syndrome (PFPS) is a syndrome characterized by pain or discomfort seemingly originating from the contact of the posterior surface of the patella (back of the kneecap) with the femur (thigh bone).

• Chorionic Villi and Placental Development

  • In the placenta, chorionic villi develop to maximize surface area contact with maternal blood for nutrient and gas exchange.
  • Chorionic villi sprout from the chorion after rapid proliferation in order to give a maximum area of contact with the maternal blood.

• Pancreas

  • The capillaries of the islets are lined by layers of endocrine cells in direct contact with vessels, and most endocrine cells are in direct contact with blood vessels, either by cytoplasmic processes or by direct apposition.

• Serosa

  • The layer in contact with the organ is known as the visceral layer, while the parietal layer is in contact with the body wall.

• Histology of the Pancreas

  • The capillaries of the islets are lined by layers of endocrine cells in direct contact with vessels, and most endocrine cells are in direct contact with blood vessels, either by cytoplasmic processes or by direct apposition.